/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (C) 2016 Gvozden Nešković. All rights reserved. */ #ifndef _VDEV_RAIDZ_H #define _VDEV_RAIDZ_H #include #include #include #ifdef __cplusplus extern "C" { #endif #define CODE_P (0U) #define CODE_Q (1U) #define CODE_R (2U) #define PARITY_P (1U) #define PARITY_PQ (2U) #define PARITY_PQR (3U) #define TARGET_X (0U) #define TARGET_Y (1U) #define TARGET_Z (2U) /* * Parity generation methods indexes */ enum raidz_math_gen_op { RAIDZ_GEN_P = 0, RAIDZ_GEN_PQ, RAIDZ_GEN_PQR, RAIDZ_GEN_NUM = 3 }; /* * Data reconstruction methods indexes */ enum raidz_rec_op { RAIDZ_REC_P = 0, RAIDZ_REC_Q, RAIDZ_REC_R, RAIDZ_REC_PQ, RAIDZ_REC_PR, RAIDZ_REC_QR, RAIDZ_REC_PQR, RAIDZ_REC_NUM = 7 }; extern const char *raidz_gen_name[RAIDZ_GEN_NUM]; extern const char *raidz_rec_name[RAIDZ_REC_NUM]; /* * Methods used to define raidz implementation * * @raidz_gen_f Parity generation function * @par1 pointer to raidz_map * @raidz_rec_f Data reconstruction function * @par1 pointer to raidz_map * @par2 array of reconstruction targets * @will_work_f Function returns TRUE if impl. is supported on the system * @init_impl_f Function is called once on init * @fini_impl_f Function is called once on fini */ typedef void (*raidz_gen_f)(void *); typedef int (*raidz_rec_f)(void *, const int *); typedef boolean_t (*will_work_f)(void); typedef void (*init_impl_f)(void); typedef void (*fini_impl_f)(void); #define RAIDZ_IMPL_NAME_MAX (16) typedef struct raidz_impl_ops { init_impl_f init; fini_impl_f fini; raidz_gen_f gen[RAIDZ_GEN_NUM]; /* Parity generate functions */ raidz_rec_f rec[RAIDZ_REC_NUM]; /* Data reconstruction functions */ will_work_f is_supported; /* Support check function */ char name[RAIDZ_IMPL_NAME_MAX]; /* Name of the implementation */ } raidz_impl_ops_t; typedef struct raidz_col { size_t rc_devidx; /* child device index for I/O */ size_t rc_offset; /* device offset */ size_t rc_size; /* I/O size */ void *rc_data; /* I/O data */ void *rc_gdata; /* used to store the "good" version */ int rc_error; /* I/O error for this device */ unsigned int rc_tried; /* Did we attempt this I/O column? */ unsigned int rc_skipped; /* Did we skip this I/O column? */ } raidz_col_t; typedef struct raidz_map { size_t rm_cols; /* Regular column count */ size_t rm_scols; /* Count including skipped columns */ size_t rm_bigcols; /* Number of oversized columns */ size_t rm_asize; /* Actual total I/O size */ size_t rm_missingdata; /* Count of missing data devices */ size_t rm_missingparity; /* Count of missing parity devices */ size_t rm_firstdatacol; /* First data column/parity count */ size_t rm_nskip; /* Skipped sectors for padding */ size_t rm_skipstart; /* Column index of padding start */ void *rm_datacopy; /* rm_asize-buffer of copied data */ size_t rm_reports; /* # of referencing checksum reports */ unsigned int rm_freed; /* map no longer has referencing ZIO */ unsigned int rm_ecksuminjected; /* checksum error was injected */ raidz_impl_ops_t *rm_ops; /* RAIDZ math operations */ raidz_col_t rm_col[1]; /* Flexible array of I/O columns */ } raidz_map_t; #define RAIDZ_ORIGINAL_IMPL (INT_MAX) extern const raidz_impl_ops_t vdev_raidz_scalar_impl; #if defined(__x86_64) && defined(HAVE_SSE2) /* only x86_64 for now */ extern const raidz_impl_ops_t vdev_raidz_sse2_impl; #endif #if defined(__x86_64) && defined(HAVE_SSSE3) /* only x86_64 for now */ extern const raidz_impl_ops_t vdev_raidz_ssse3_impl; #endif #if defined(__x86_64) && defined(HAVE_AVX2) /* only x86_64 for now */ extern const raidz_impl_ops_t vdev_raidz_avx2_impl; #endif /* * Commonly used raidz_map helpers * * raidz_parity Returns parity of the RAIDZ block * raidz_ncols Returns number of columns the block spans * raidz_nbigcols Returns number of big columns columns * raidz_col_p Returns pointer to a column * raidz_col_size Returns size of a column * raidz_big_size Returns size of big columns * raidz_short_size Returns size of short columns */ #define raidz_parity(rm) ((rm)->rm_firstdatacol) #define raidz_ncols(rm) ((rm)->rm_cols) #define raidz_nbigcols(rm) ((rm)->rm_bigcols) #define raidz_col_p(rm, c) ((rm)->rm_col + (c)) #define raidz_col_size(rm, c) ((rm)->rm_col[c].rc_size) #define raidz_big_size(rm) (raidz_col_size(rm, CODE_P)) #define raidz_short_size(rm) (raidz_col_size(rm, raidz_ncols(rm)-1)) /* * Macro defines an RAIDZ parity generation method * * @code parity the function produce * @impl name of the implementation */ #define _RAIDZ_GEN_WRAP(code, impl) \ static void \ impl ## _gen_ ## code(void *rmp) \ { \ raidz_map_t *rm = (raidz_map_t *) rmp; \ raidz_generate_## code ## _impl(rm); \ } /* * Macro defines an RAIDZ data reconstruction method * * @code parity the function produce * @impl name of the implementation */ #define _RAIDZ_REC_WRAP(code, impl) \ static int \ impl ## _rec_ ## code(void *rmp, const int *tgtidx) \ { \ raidz_map_t *rm = (raidz_map_t *) rmp; \ return (raidz_reconstruct_## code ## _impl(rm, tgtidx)); \ } /* * Define all gen methods for an implementation * * @impl name of the implementation */ #define DEFINE_GEN_METHODS(impl) \ _RAIDZ_GEN_WRAP(p, impl); \ _RAIDZ_GEN_WRAP(pq, impl); \ _RAIDZ_GEN_WRAP(pqr, impl) /* * Define all rec functions for an implementation * * @impl name of the implementation */ #define DEFINE_REC_METHODS(impl) \ _RAIDZ_REC_WRAP(p, impl); \ _RAIDZ_REC_WRAP(q, impl); \ _RAIDZ_REC_WRAP(r, impl); \ _RAIDZ_REC_WRAP(pq, impl); \ _RAIDZ_REC_WRAP(pr, impl); \ _RAIDZ_REC_WRAP(qr, impl); \ _RAIDZ_REC_WRAP(pqr, impl) #define RAIDZ_GEN_METHODS(impl) \ { \ [RAIDZ_GEN_P] = & impl ## _gen_p, \ [RAIDZ_GEN_PQ] = & impl ## _gen_pq, \ [RAIDZ_GEN_PQR] = & impl ## _gen_pqr \ } #define RAIDZ_REC_METHODS(impl) \ { \ [RAIDZ_REC_P] = & impl ## _rec_p, \ [RAIDZ_REC_Q] = & impl ## _rec_q, \ [RAIDZ_REC_R] = & impl ## _rec_r, \ [RAIDZ_REC_PQ] = & impl ## _rec_pq, \ [RAIDZ_REC_PR] = & impl ## _rec_pr, \ [RAIDZ_REC_QR] = & impl ## _rec_qr, \ [RAIDZ_REC_PQR] = & impl ## _rec_pqr \ } typedef struct raidz_impl_kstat { uint64_t gen[RAIDZ_GEN_NUM]; /* gen method speed B/s */ uint64_t rec[RAIDZ_REC_NUM]; /* rec method speed B/s */ } raidz_impl_kstat_t; /* * Enumerate various multiplication constants * used in reconstruction methods */ typedef enum raidz_mul_info { /* Reconstruct Q */ MUL_Q_X = 0, /* Reconstruct R */ MUL_R_X = 0, /* Reconstruct PQ */ MUL_PQ_X = 0, MUL_PQ_Y = 1, /* Reconstruct PR */ MUL_PR_X = 0, MUL_PR_Y = 1, /* Reconstruct QR */ MUL_QR_XQ = 0, MUL_QR_X = 1, MUL_QR_YQ = 2, MUL_QR_Y = 3, /* Reconstruct PQR */ MUL_PQR_XP = 0, MUL_PQR_XQ = 1, MUL_PQR_XR = 2, MUL_PQR_YU = 3, MUL_PQR_YP = 4, MUL_PQR_YQ = 5, MUL_CNT = 6 } raidz_mul_info_t; /* * Powers of 2 in the Galois field. */ extern const uint8_t vdev_raidz_pow2[256] __attribute__((aligned(256))); /* Logs of 2 in the Galois field defined above. */ extern const uint8_t vdev_raidz_log2[256] __attribute__((aligned(256))); /* * Multiply a given number by 2 raised to the given power. */ static inline uint8_t vdev_raidz_exp2(const uint8_t a, const unsigned exp) { if (a == 0) return (0); return (vdev_raidz_pow2[(exp + (unsigned) vdev_raidz_log2[a]) % 255]); } /* * Galois Field operations. * * gf_exp2 - computes 2 raised to the given power * gf_exp2 - computes 4 raised to the given power * gf_mul - multiplication * gf_div - division * gf_inv - multiplicative inverse */ typedef unsigned gf_t; typedef unsigned gf_log_t; static inline gf_t gf_mul(const gf_t a, const gf_t b) { gf_log_t logsum; if (a == 0 || b == 0) return (0); logsum = (gf_log_t) vdev_raidz_log2[a] + (gf_log_t) vdev_raidz_log2[b]; return ((gf_t) vdev_raidz_pow2[logsum % 255]); } static inline gf_t gf_div(const gf_t a, const gf_t b) { gf_log_t logsum; ASSERT3U(b, >, 0); if (a == 0) return (0); logsum = (gf_log_t) 255 + (gf_log_t) vdev_raidz_log2[a] - (gf_log_t) vdev_raidz_log2[b]; return ((gf_t) vdev_raidz_pow2[logsum % 255]); } static inline gf_t gf_inv(const gf_t a) { gf_log_t logsum; ASSERT3U(a, >, 0); logsum = (gf_log_t) 255 - (gf_log_t) vdev_raidz_log2[a]; return ((gf_t) vdev_raidz_pow2[logsum]); } static inline gf_t gf_exp2(gf_log_t exp) { return (vdev_raidz_pow2[exp % 255]); } static inline gf_t gf_exp4(gf_log_t exp) { ASSERT3U(exp, <=, 255); return ((gf_t) vdev_raidz_pow2[(2 * exp) % 255]); } #ifdef __cplusplus } #endif #endif /* _VDEV_RAIDZ_H */